Join Inheritance causing problem with subclass collection mapping ----------------------------------------------------------------- Key: EJBTHREE-378 URL: http://jira.jboss.com/jira/browse/EJBTHREE-378 Project: EJB 3.0 Issue Type: Bug Affects Versions: EJB 3.0 RC3 Environment: Ubuntu Linux (5.0.4), JBoss 4.0.3RC2 Reporter: Michael Small Assigned To: Emmanuel Bernard Attachments: Client.java, ClientContact.java, Provider.java, ProviderContact.java, Relationship.java, RelationshipBinding.java, ValueObject.java I have the following class structure: ValueObject Relationship RelationshipBinding Participant Client Provider Employee ValueObject is a EmbeddableSuperClass which Relationship extends. Relationship has a @OneToMany bidirectional association with RelationshipBinding. Participant, Client, Provider, and Employee extend RelationshipBinding using the JOIN strategy. The Participant and Employee VOs have associations to Contact objects (@OneToOne) ... works fine. The Client and Provider VOs have associations to ClientContact and ProviderContact objects, respectively, using a bidirectional @OneToMany. Strangley, when I query for a Provider, I get the following stack trace: 11:42:28,279 ERROR [BasicPropertyAccessor] IllegalArgumentException in class: com.tasconline.client.ClientContact, setter method of property: client 11:42:28,279 ERROR [BasicPropertyAccessor] expected type: com.tasconline.client.Client, actual value: com.tasconline.provider.Provider 11:42:28,279 INFO [DefaultLoadEventListener] Error performing load command org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.tasconline.client.ClientContact.client at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:104) at org.hibernate.tuple.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:330) at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:188) at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3231) at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:126) at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842) at org.hibernate.loader.Loader.doQuery(Loader.java:717) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:223) at org.hibernate.loader.Loader.loadEntity(Loader.java:1782) at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:93) at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:81) at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2729) at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:365) at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:346) at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:123) at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:177) at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87) at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:781) at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:753) at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266) at org.hibernate.type.EntityType.resolve(EntityType.java:303) at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:113) at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842) at org.hibernate.loader.Loader.doQuery(Loader.java:717) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:223) at org.hibernate.loader.Loader.doList(Loader.java:2147) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2026) at org.hibernate.loader.Loader.list(Loader.java:2021) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:369) at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:296) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:992) at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74) at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:650) at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:43) at com.tasconline.provider.service.bean.ProviderServiceBean.findProvider(ProviderServiceBean.java:563) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:109) at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:32) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:66) at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:134) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:61) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:39) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.aspects.security.RoleBasedAuthorizationInterceptor.invoke(RoleBasedAuthorizationInterceptor.java:151) at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptor.invoke(RoleBasedAuthorizationInterceptor.java:85) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:63) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:32) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:91) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:204) at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:107) at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:69) at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:566) at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:436) at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:239) at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:277) at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:168) Caused by: java.lang.IllegalArgumentException: argument type mismatch at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:42) ... 65 more Here's the query and code where the error occurs: SELECT p FROM Provider p WHERE p.relationship.relationshipId LIKE :expression OR p.taxId LIKE :expression OR p.organizationName LIKE :expression Here's the code that calls the query: List<Provider> queryResults = (List<Provider>) this.entityManager .createQuery(FIND_PROVIDER_FOR_TASC_FORCE_QUERY) .setParameter("expression", expression) .getResultList(); Note that FIND_PROVIDER_FOR_TASC_FORCE_QUERY is the query string above. I've tried different query formats and event Query.getSingleResult() ... all produce the same error. I posted the problem on the forum (along with reading just about all the EJB3 and Hibernate documentation).